Composition for use in automobile tire casings



y 45 It is advisable to Patented Dec. l d, 1924..

GHARLQ W. SCHNELL, F FRESNO, CALIFOB.

comet: non use at AUTOMOBILE rinn casmas.

Ea Drag.

To all whom it may concern."

Be it known that I, CHARLES W. SoHNELL, a citizen of- United States, residing at Fresno, in the county of Fresno and State of California, have invented new and useful ImprovementsinCompositions for Use in Automobile Tire Casings, of which the following is a specification.

The present invention relates to a. powder which is to be used in the dry form by sprinkling a small amount thereof into the casing of anautomobile tire, after whlch the composition may be spread around evenly over the inner surface of the tire casing, to prevent friction and heating and wear which are caused by therubbing of the inner tube against the inner surface of the tire casing. It is well known that in the operation of an automobile, there is considerable friction and consequent wear of the inner tube, caused by the rubbing of the innertube against the casing, and it isthe object of the present invention to provide -a composition which can be placed in the casing, thereby preventing the said friction and consequent rapid wearing out of the inner tube. In accordance with the present invention, I employ in the composition preferably ingredients being preferably employed in the proportions stated. r

r In preparing the composition I take a given quantity, say, 100 parts by weight of graphite, and reduce this to an impalpable powder. With this is incorporated about parts by'weight of lampblack, and also preferably about 65 partsof powdered uncalcined mica. Y

40 In producing the com ound the three inm gredients may be groun together, in order to produce in the gnnding operation a com-.

plete and intimate miiture'of the powdered materials.

K reduce the material to an extremely finely-divided condition, viz, an i rnpalpable powder, so as not to leave any gritty particles which could act to abrade or put the surface of the inner tube. to The composition can beam at the time of first putting the same onto the wheels or it can likewise be applied to old tires, for example, at the time of changthe tire in any desired quantity, I find that three lngredients as mentioned below, these .and giving an additional 25% -to.50% more 'ment in the casings of pliedto new tires 1 Application filed September 4, 1920. I Serial No. 408,148.

ing the tires for repairs, or at any other suitable time. 7 I

The composition effectively produces the results above referred to.

The composition thus once applied to a particular tire casing will to a certainextent be taken up or will adhere to the interior of the casing, and this composition will not wearout. It may to some extent be removed if it should be necessary to fre quently remove the tire casing, and for this purpose a small additional quantity of the composition can be placed in the casing whenever the inner tube has to be taken out or renewed. 1

While the composition can be applied to 7 0' excellent results are producedby the use of 2 ounces of the composition in an ordinarysized automobile tire. i

F inely-powdered soapstone or talc can be substitutedfor apart of the powdered mica, with the production of fairly good results. Accordingly, the term mica as used in the specification and claims, is intended to, cover the use of talc, whether substituted for all or a part of the mica. When so-substituting, a pound of the talc is equivalent to a pound of mica, approximately.

The used the powders, allmixed to-v gether, is found in practice to greatly protect the life of the inner tube. It prevents the inner tube from getting out of shape and also preserves the fabric in-the tire casing. The powder also stops the tread and fabric om separating, thereby preserving the tire I I miles wear than could be secured without the use of this powder.

I claim: 1. A composition of matter for employautomo'bile tires, the said composition ,comprising powdered graphite, powdered mica and lampblack. 2 e herein described composition of matter suitable for automobile tires, the same comprising a pillverulent mixture of about .100 graphite, about 35 parts oflampblackand' about 65 parts of mica. v

In testimony whereof I aflix my signa-.

ture. I CHARLES w.:soHNEn 4,

placing in' thecasings of o parts of 

